Electric switch



(No Model.)

P. SCHWEDTMANN.

ELECTRIC SWITCH.

No. 594,656. Patented Nov. 30,1897.

WW1/renom J4/twente@ 551g atto/mam@ i i UNITED STATES PATENT OEETCE.

FERDINAND SOIIVVEDTMANN, OF ST. LOUIS, MISSOURI.

ELECTRIC SWITCH.

SPECIFICATION forming part of Letters 'Patent No. 594,656, dated November 30, 1897.

Application tiled December 14, 1896. Serial No. 615,705, (No model.)

To all whom it may concer/'n.-

Beit known that I, FERDINAND SGHWEDT- MANN, a citizen of the United States, residing at the city of St. Louis, in the State of Missouri, have invented a certain new and useful Electric Switch, of which the following is such a full, clear, and eXact description as will enable any one skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, forming part of this specification.

The object of my invention is to construct an electric switch so that the switch-blade will make good contact with the pivot-post and the contact-post.

Another object of my invention is to provide means for preventing the formation of an arc between the switch-blade and the contact-post.

Another object of my invention is to pro Vide a binding-post whichwill make better contact with the linetermin al than those now in use.

My invention consists in the various novel features and details of construction described in the following specification and set forth in the claims aflixed hereto.

In the accompanyingdrawings, which illustrate a switch made in accordance with my invention, Figure 1 is a side elevation. Fig. 2 is a top plan view. Fig. 3 is a side elevation showing the switch open. Fig. A1 is a vertical longitudinal section through the contact-post. Fig. 5 is a cross-section through the'carbon contact-piece. Fig. G is an enlarged isometric projection of the pivot-post, and Fig. 7 is an enlarged isometric projection of the contact-post.

Like marks of reference refer to similar Aparts in the several views of the drawings.

of a switch-blade 14, provided with a handle 15, of insulating material.

Secured to the base 10 in any suitable manner is a contactpost 17. In the post 17 are secured two sprin gs 1S at a sufficient distance apart to receive the switch-blade 1i between them. At the outer sides of the springs 1S and bearing against them are two springs 19. The springs 1S and 19 are divided into a number of parts by slots c, the slots being arranged so as to break joints, as best shown in Fig. 7. On the inner end of the post 17 is formed a downward tubular projection 21, which extends down through the base 10. In the projection 21 is formed an opening,` 22, Fig. et. In the opening 22 is a coil-spring 23, which is held in place by a screw-threaded plug 21. Upon the spring 23 rests a carbon rod 25. The rod 25 is cylindrical in form and has two grooves formed in it, leaving a tongue or projection 26, Figs. 4 and 5, which slides between the springs 1S. On the posts 11 and 17 are formed projections 2S and 29, respectively, to each of which is secured a binding-post 30.

The operation of my switch is as follows: The springs 13 yield sufficiently to allow the switch-blade 14E to make good electrical contact with them, thus preventing heating of the pivot. The springs 1S and 19 by their arrangement press firmly against the switchblade when the switch is closed and make a much better contact than could be secured with solid pieces of spring metal of sufficient thickness to carry the desired current.

By the arrangement of the carbon rod 25 no special guide is required, as the springs 1S act as guides. Another advantage of this arrangement is that the point at which the blade makes contact with the rod is outside of the spring-contacts, thus preventing any injury to the contact between the blade and the springs.

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent of the United States, is*

1. In an electric switch, a suitable contact part, a switch-blade adapted to make contact therewith, a solid pivotpost carrying said switch-blade and having formed in it a slot at the termination of the opening for the reception of the said switch-blade, and a contactspring iirmly secured in said slot with the free end between said pivot-post and said switch-blade.

ICO

2. In an electric switch, a suitable contactpost, a switch-blade adapted to inalie contact therewith7 a solid pivot-post carrying said switch-blade and having Eorined in it two slots at the termination of the opening for the reception of the said switch-blade, and two contact-springs iirnily secured in said Slots and having their free ends interposed between said pivot-pest and switch-blade, one being at each side of said blade.

3. In an electric switch, a suitable pivotpost, a switchblade carried thereby, a contact-post, and a plurality of contact-springs carried by said contact-post, said contactsprings being divided into a number of parts and the division of the several springs arranged eut of register.

li. In an electric switch, a pivot-post, a switch-blade carried thereby, a contact-pest, a plurality of contact-springs at each side of said contact-post and carried thereby, the springs of each set being divided into a nurnber of parts and the division arranged ont of register.

5. In an electric switch, a pivotpost, a switch-blade carried thereby7 a contact-post, a contact spring or springs at each side of Said contact-post and adapted to receive said blade between thein, a spring-actuated contact-piece of conducting material carried by said contact-post, and a projection or tongue on said contact-piece and sliding between said contact-springs.

In testimony whereof have hereunto set my hand and seal in the presence ef the two subscribing witnesses.

FERDINND Stiill'illl'liliANN. iVii-nesses:

W. A. ALEXANDER, E. E. VERNETJ.. 

